Welcome to JavaRanch!
I would think that 1.4 GB would be plenty of space for Sun's
Java 2 SDK with NetBeans, which it appears you are trying to install.
Is it possible that the installation routine is actually attempting to use temporary space on a different partition? Perhaps on the primary Windows installation partition? How much free space is on that drive?
Otherwise, is it possible that your user account does not have permission to install the J2SDK? If that were the case, I'd expect you to be seeing a different error message - one that complains about account permissions.